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Finding the Fourth Proportional to 547.78, 821.72 and 223.11

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Solution

The fourth proportional to 547.78, 821.72 and 223.11 is: 334.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.78 : 821.72 = 223.11 : x
  2. Step 2: Convert to fraction form
    547.78/821.72 = 223.11/x
  3. Step 3: Cross multiply
    547.78x = 821.72 × 223.11
  4. Step 4: Simplify right side
    547.78x = 183,333.95
  5. Step 5: Solve for x
    x = 183,333.95/547.78
  6. Step 6: Final answer
    x = 334.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.